/* Instituto de Microbiótica — microbiotica.es
   Azul InMi sobre blanco; la tierra oscura se reserva para "Raíces" y el pie. */

:root {
  --azul: #2a7bd3;
  --azul-hondo: #1d5ea8;
  --cielo: #7fc3ee;
  --agua: #e8f2fb;
  --agua-2: #d1e5f4;
  --tinta: #182231;
  --tinta-suave: #4a5a70;
  --tierra: #14365f;
  --tierra-2: #24497a;
  --tierra-texto: #e8f2fb;
  --tierra-suave: #a9c3de;
  --blanco: #ffffff;

  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --texto: "Source Serif 4", Georgia, serif;

  --ancho: 1200px;
  --lectura: 38rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --seccion: clamp(3.25rem, 6.5vw, 5.5rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--blanco);
  color: var(--tinta);
  font-family: var(--texto);
  font-size: clamp(1.0625rem, 0.4vw + 1rem, 1.1875rem);
  line-height: 1.65;
  font-optical-sizing: auto;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--azul-hondo); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--azul); }
:focus-visible { outline: 3px solid var(--azul); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 650;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 0.6em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.6rem, 5.6vw, 4.9rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(2rem, 3.6vw, 3.1rem); letter-spacing: -0.03em; }
h3 { font-size: clamp(1.35rem, 1.6vw, 1.6rem); }
p { margin: 0 0 1.1em; text-wrap: pretty; }

.envoltura { width: min(100% - 2 * var(--gutter), var(--ancho)); margin-inline: auto; }
.lectura { max-width: var(--lectura); }
.entradilla { font-size: 1.2em; line-height: 1.55; color: var(--tinta-suave); }
.salto { position: absolute; left: -9999px; }
.salto:focus { left: 1rem; top: 1rem; z-index: 99; background: var(--blanco); padding: .6rem 1rem; }

/* ---------- Botones ---------- */
.boton {
  display: inline-flex; align-items: center; gap: .5em;
  font-family: var(--display); font-weight: 600; font-size: 1rem;
  padding: .85em 1.4em; border-radius: 999px;
  background: var(--azul); color: var(--blanco); text-decoration: none;
  border: 2px solid var(--azul);
  transition: background-color .18s ease, border-color .18s ease, color .18s ease;
}
.boton:hover { background: var(--azul-hondo); border-color: var(--azul-hondo); color: var(--blanco); }
.boton:active { transform: translateY(1px); }
.boton--hueco { background: transparent; color: var(--azul-hondo); border-color: var(--agua-2); }
.boton--hueco:hover { background: var(--agua); color: var(--azul-hondo); border-color: var(--agua-2); }
.botones { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }

/* ---------- Cabecera ---------- */
.cabecera {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--agua-2);
}
.cabecera .envoltura { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; min-height: 4.5rem; }
.marca { display: flex; align-items: center; gap: .7rem; text-decoration: none; color: var(--tinta); }
.marca img { width: 30px; height: auto; }
.marca span { font-family: var(--display); font-weight: 600; font-size: 1.05rem; line-height: 1.05; letter-spacing: -0.01em; }
.marca small { display: block; font-weight: 400; font-size: .8rem; color: var(--tinta-suave); letter-spacing: 0; }

.menu { display: flex; align-items: center; gap: clamp(.9rem, 2vw, 1.8rem); }
.menu a { font-family: var(--display); font-size: .98rem; color: var(--tinta); text-decoration: none; padding: .4rem 0; }
.menu a:hover, .menu a[aria-current="page"] { color: var(--azul-hondo); box-shadow: inset 0 -2px 0 var(--cielo); }
.menu .boton { padding: .6em 1.15em; font-size: .95rem; color: var(--blanco); box-shadow: none; }
.menu .boton:hover { color: var(--blanco); box-shadow: none; }
.abrir-menu { display: none; }

@media (max-width: 960px) {
  .abrir-menu {
    display: inline-flex; align-items: center; gap: .5rem;
    font: 600 1rem var(--display); color: var(--tinta);
    background: none; border: 1px solid var(--agua-2); border-radius: 999px; padding: .5rem 1rem; cursor: pointer;
  }
  .menu {
    position: absolute; inset: 100% 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--blanco); border-bottom: 1px solid var(--agua-2);
    padding: .5rem var(--gutter) 1.5rem; display: none;
  }
  .menu.abierto { display: flex; }
  .menu a { padding: .9rem 0; border-bottom: 1px solid var(--agua); font-size: 1.1rem; }
  .menu a:hover, .menu a[aria-current="page"] { box-shadow: none; }
  .menu .boton { margin-top: 1rem; justify-content: center; border-bottom: 0; }
}

/* ---------- Portada ---------- */
.portada { padding-block: clamp(3rem, 7vw, 6rem) var(--seccion); }
.portada .envoltura { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(2rem, 6vw, 5.5rem); align-items: center; }
.portada h1 { max-width: 12ch; }
.portada .entradilla { max-width: 34rem; }
.portada figure { margin: 0; position: relative; }
.portada figure img {
  width: 100%; aspect-ratio: 4 / 5; object-fit: cover;
  border-radius: 999px 999px 18px 18px;
}
.portada figcaption { font-size: .9rem; color: var(--tinta-suave); margin-top: .8rem; font-style: italic; }
@media (max-width: 820px) {
  .portada .envoltura { grid-template-columns: 1fr; }
  .portada figure { max-width: 22rem; }
}

/* ---------- Secciones genéricas ---------- */
.seccion { padding-block: var(--seccion); }
.seccion--agua { background: var(--agua); }
.cabeza-seccion { max-width: 46rem; margin-bottom: clamp(1.75rem, 3.5vw, 2.75rem); }
.cabeza-seccion .entradilla { margin-bottom: 0; }
.cabeza-seccion--ramas { margin-top: clamp(3rem, 6vw, 4.5rem); }

/* Qué es */
.definicion { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.cita-grande {
  margin: 0; font-family: var(--texto); font-size: clamp(1.5rem, 2.4vw, 2.05rem);
  line-height: 1.38; font-weight: 400; color: var(--tinta);
}
.cita-grande p { margin: 0 0 .9rem; }
.cita-grande p::before { content: "«"; } .cita-grande p::after { content: "»"; }
.cita-grande cite, .cita cite { display: block; font: 400 .95rem var(--display); font-style: normal; color: var(--tinta-suave); }
@media (max-width: 820px) { .definicion { grid-template-columns: 1fr; } }

/* Entropía / sintropía */
.contraste { display: grid; grid-template-columns: 1fr 1fr; margin-top: clamp(3.5rem, 7vw, 6rem); border-radius: 18px; overflow: hidden; }
.contraste > div { padding: clamp(1.75rem, 4vw, 3.25rem); }
.contraste h3 { margin-bottom: .4em; }
.contraste p { margin: 0; }
.contraste .caos { background: #eceef1; color: var(--tinta-suave); }
.contraste .orden { background: var(--azul-hondo); color: var(--blanco); }
.contraste .orden h3 { color: var(--blanco); }
.contraste .palabra { display: block; font: 500 .95rem var(--display); margin-top: 1.25rem; opacity: .75; }
@media (max-width: 700px) { .contraste { grid-template-columns: 1fr; } }

/* Dos ramas */
.ramas { display: grid; gap: clamp(2.5rem, 7vw, 5.5rem); margin-top: clamp(2rem, 4vw, 3rem); }
.rama { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: clamp(1.25rem, 5vw, 4rem); align-items: center; }
.rama-media { position: relative; display: flex; justify-content: center; align-items: center; padding: clamp(.5rem, 2vw, 1.5rem); }
.rama-media img { width: min(430px, 92%); height: auto; border-radius: 16px; box-shadow: 0 26px 54px -32px rgba(20,54,95,.5); }
.rama--invertida .rama-media { order: 2; }
.rama h3 { margin-top: 0; }
.rama .pregunta { font-family: var(--display); font-size: clamp(1.2rem, 2.2vw, 1.45rem); line-height: 1.3; color: var(--azul-hondo); margin-top: 0; }
.rama .enlace { font-family: var(--display); font-weight: 600; display: inline-block; margin-top: .5rem; }
@media (max-width: 760px) { .rama--invertida .rama-media { order: 0; } }

/* ---------- Raíces (lo memorable) ---------- */
.raices { background: #eceef1; color: var(--tinta); padding-block: var(--seccion); position: relative; overflow: hidden; }
.raices h2 { color: var(--tinta); }
.raices .entradilla { color: var(--tinta-suave); }
.raices a { color: var(--azul-hondo); }
.linea {
  display: flex; gap: 1.25rem; overflow-x: auto; overflow-y: hidden;
  scroll-snap-type: x proximity; -webkit-overflow-scrolling: touch;
  margin-top: clamp(1.5rem, 3vw, 2.5rem); padding: .5rem .25rem 1.5rem;
  scrollbar-color: var(--cielo) transparent;
}
.linea::-webkit-scrollbar { height: 9px; }
.linea::-webkit-scrollbar-thumb { background: var(--cielo); border-radius: 999px; }
.linea { position: relative; }
.hito {
  position: relative; z-index: 1;
  flex: 0 0 clamp(230px, 74vw, 290px); scroll-snap-align: start; text-align: left;
  background: var(--blanco); border-radius: 18px; padding: 1.3rem 1.35rem;
  box-shadow: 0 14px 34px -20px rgba(20,54,95,.28);
}
.hito .retratos { justify-content: flex-start; }
.hito .cuando { font: 600 1rem var(--display); color: var(--azul-hondo); display: block; margin-bottom: .2rem; }
.hito h3 { color: var(--tinta); margin-bottom: .35em; }
.hito p { color: var(--tinta-suave); margin: 0; font-size: 1rem; }
.hito q { quotes: "«" "»"; font-style: italic; }
.hito--inmi { flex-basis: clamp(250px, 80vw, 320px); }
.hito--inmi h3 { font-size: clamp(1.4rem, 2.4vw, 1.9rem); }
/* Las tarjetas aparecen al entrar en la tira (solo con JS). */
.js .hito { opacity: 0; transform: translateX(28px); transition: opacity .55s ease, transform .55s ease; }
.js .hito.dentro { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .hito { opacity: 1; transform: none; transition: none; } }

/* ---------- Lo invisible ---------- */
.cifras { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; }
.cifras li {
  display: grid; grid-template-columns: minmax(9rem, 14rem) 1fr; gap: clamp(1rem, 4vw, 3rem);
  padding-block: clamp(1.5rem, 3vw, 2.25rem); border-top: 1px solid var(--agua-2); align-items: baseline;
}
.cifras li:last-child { border-bottom: 1px solid var(--agua-2); }
.cifras strong { font: 650 clamp(2.2rem, 4.5vw, 3.6rem) / 1 var(--display); letter-spacing: -0.035em; color: var(--azul-hondo); }
.cifras p { margin: 0; font-size: clamp(1.15rem, 1.5vw, 1.35rem); line-height: 1.5; max-width: 40rem; }
.cifras small { display: block; font: 400 .9rem var(--display); color: var(--tinta-suave); margin-top: .4rem; }
@media (max-width: 600px) { .cifras li { grid-template-columns: 1fr; gap: .5rem; } }

/* ---------- Curso ---------- */
.curso { display: grid; grid-template-columns: .95fr 1.05fr; gap: clamp(2rem, 6vw, 5rem); align-items: center; }
.curso img { border-radius: 18px; }
.curso .datos { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; padding: 0; margin: 1.5rem 0 0; list-style: none; font-family: var(--display); }
.curso .datos li { display: flex; align-items: baseline; gap: .4rem; }
.curso .datos b { font-size: 1.5rem; color: var(--azul-hondo); }
@media (max-width: 860px) { .curso { grid-template-columns: 1fr; } }

.profes { display: grid; grid-template-columns: repeat(auto-fill, minmax(8.5rem, 1fr)); gap: 1.75rem 1.25rem; margin-top: clamp(3rem, 6vw, 4.5rem); }
.profe { margin: 0; text-align: center; }
.profe img { width: 100%; max-width: 7.5rem; aspect-ratio: 1; object-fit: cover; border-radius: 50%; margin: 0 auto .7rem; filter: saturate(.85); }
.profe figcaption { font: 600 .95rem/1.25 var(--display); }
.profe small { display: block; font: 400 .82rem/1.35 var(--display); color: var(--tinta-suave); margin-top: .25rem; }

/* Programa */
.modulos { list-style: none; padding: 0; margin: 0; counter-reset: modulo; }
.modulos li {
  counter-increment: modulo; display: grid; grid-template-columns: 4rem 1fr; gap: 1rem;
  padding-block: 1.4rem; border-top: 1px solid var(--agua-2);
}
.modulos li:last-child { border-bottom: 1px solid var(--agua-2); }
.modulos li::before { content: counter(modulo); font: 650 2rem/1 var(--display); color: var(--cielo); }
.modulos h3 { margin: 0 0 .25rem; font-size: 1.3rem; }
.modulos p { margin: 0; color: var(--tinta-suave); font-size: 1rem; }

.incluye { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 2rem 3rem; }
.incluye h3 { font-size: 1.2rem; margin-bottom: .3em; }
.incluye p { margin: 0; color: var(--tinta-suave); font-size: 1rem; }

/* ---------- Libros ---------- */
.libros { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(1rem, 3vw, 2rem); }
.libro { text-decoration: none; color: var(--tinta); display: flex; flex-direction: column; }
.libro img { border-radius: 10px; aspect-ratio: 1; object-fit: cover; background: var(--agua); box-shadow: 0 18px 40px -22px rgba(20,54,95,.45); transition: transform .25s cubic-bezier(.2,.8,.2,1), box-shadow .25s ease; }
.libro:hover img { transform: translateY(-6px); box-shadow: 0 30px 56px -24px rgba(20,54,95,.52); }
.libro h3 { font-size: 1.15rem; margin: 1rem 0 .3rem; }
.libro p { font-size: .95rem; color: var(--tinta-suave); margin: 0 0 .6rem; line-height: 1.5; }
.libro span { font: 600 .95rem var(--display); color: var(--azul-hondo); margin-top: auto; }
@media (max-width: 900px) { .libros { grid-template-columns: 1fr 1fr; } }
@media (prefers-reduced-motion: reduce) { .libro img { transition: none; } .libro:hover img { transform: none; } }

/* ---------- Quiénes somos ---------- */
.nosotros-card {
  max-width: 760px; margin: 0 auto; text-align: center;
  background: var(--blanco); border-radius: 22px;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.5rem, 5vw, 3.5rem);
  box-shadow: 0 30px 60px -36px rgba(20,54,95,.4);
}
.nosotros-card h2 { margin-top: 0; }
.nosotros-card > p { color: var(--tinta-suave); margin-inline: auto; max-width: 58ch; }
.manifiesto-cita {
  margin: 2rem auto 0; max-width: 54ch;
  padding-top: 1.75rem; border-top: 1px solid var(--agua-2);
}
.manifiesto-cita p { font-size: 1.12em; line-height: 1.5; color: var(--tinta); font-style: italic; margin: 0; }
.manifiesto-cita cite { display: block; margin-top: .9rem; font-style: normal; font-size: .9rem; color: var(--azul-hondo); }
.sellos { display: flex; align-items: center; justify-content: center; gap: clamp(1.25rem, 4vw, 2.25rem); margin-top: 2.25rem; }
.sellos .sello-inmi { height: 52px; width: auto; }
.sellos .sello-fund { height: 54px; width: auto; border-radius: 8px; }
.sello-sep { width: 1px; height: 46px; background: var(--agua-2); }
.sellos-pie { margin: 1rem auto 0; font-size: .85rem; color: var(--tinta-suave); }
.nosotros-card .botones { justify-content: center; margin-top: 1.75rem; }
.fundacion-card { margin-top: clamp(1.5rem, 4vw, 2.5rem); }
.fundacion-logo { display: block; height: 100px; width: auto; margin: 0 auto 1.4rem; }
@media (max-width: 480px) { .sellos { flex-wrap: wrap; } .sello-sep { display: none; } }

/* ---------- Páginas interiores ---------- */
.cabeza-pagina { padding-block: clamp(3rem, 7vw, 5.5rem) clamp(2.5rem, 5vw, 4rem); background: var(--agua); }
.cabeza-pagina h1 { max-width: 16ch; }
.cabeza-pagina .entradilla { max-width: 40rem; margin: 0; }

/* ---------- Blog ---------- */
.blog-vacio { max-width: 640px; margin: 0 auto; text-align: center; background: var(--blanco); border-radius: 22px; padding: clamp(2.5rem, 6vw, 4rem); box-shadow: 0 30px 60px -36px rgba(20,54,95,.4); }
.blog-vacio h2 { margin-top: 0; }
.blog-vacio p { color: var(--tinta-suave); margin-inline: auto; max-width: 48ch; }
.blog-vacio .botones { justify-content: center; margin-top: 1.75rem; }
.blog-rejilla { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: clamp(1.5rem, 3vw, 2.25rem); }
.post { display: flex; flex-direction: column; background: var(--blanco); border-radius: 18px; overflow: hidden; box-shadow: 0 16px 36px -24px rgba(20,54,95,.3); text-decoration: none; color: inherit; transition: transform .2s ease, box-shadow .2s ease; }
.post:hover { transform: translateY(-4px); box-shadow: 0 26px 50px -26px rgba(20,54,95,.42); }
.post img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.post__cuerpo { padding: 1.25rem 1.4rem 1.6rem; display: flex; flex-direction: column; gap: .5rem; }
.post__fecha { font: 600 .8rem var(--display); color: var(--azul-hondo); text-transform: uppercase; letter-spacing: .04em; }
.post h3 { margin: 0; font-size: 1.2rem; }
.post p { margin: 0; color: var(--tinta-suave); font-size: .98rem; }

/* ---------- Entrada de blog ---------- */
.entrada .envoltura { max-width: 760px; }
.entrada .volver { display: inline-block; margin-bottom: 1.5rem; font-family: var(--display); font-weight: 600; color: var(--azul-hondo); text-decoration: none; }
.entrada__cabeza { margin-bottom: 2rem; }
.entrada__cabeza h1 { margin: .4rem 0; }
.entrada__portada img { width: 100%; border-radius: 18px; margin-bottom: 2rem; }
.prosa { font-size: 1.08rem; line-height: 1.75; }
.prosa > * + * { margin-top: 1.1rem; }
.prosa h2 { margin-top: 2.2rem; }
.entrada__firma { margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px solid var(--agua-2); font-family: var(--display); font-weight: 600; color: var(--azul-hondo); }
.bloque { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 5rem); align-items: center; }
.bloque + .bloque { margin-top: var(--seccion); }
.bloque img { border-radius: 18px; width: 100%; aspect-ratio: 4 / 5; object-fit: cover; }
.bloque--al-reves > :first-child { order: 2; }
@media (max-width: 820px) { .bloque { grid-template-columns: 1fr; } .bloque--al-reves > :first-child { order: 0; } .bloque img { aspect-ratio: 3 / 2; } }

.usos { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 2.25rem 3rem; }
.usos h3 { font-size: 1.25rem; margin-bottom: .3em; }
.usos p { margin: 0; color: var(--tinta-suave); font-size: 1rem; }

.principios { list-style: none; padding: 0; margin: 0; counter-reset: p; }
.principios li { counter-increment: p; display: grid; grid-template-columns: 2.5rem 1fr; padding-block: 1rem; border-top: 1px solid var(--agua-2); font-size: 1.15rem; }
.principios li:last-child { border-bottom: 1px solid var(--agua-2); }
.principios li::before { content: counter(p); font: 650 1.3rem/1.5 var(--display); color: var(--azul); }

.glosario { display: grid; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); gap: 2rem 3rem; margin: 0; }
.glosario dt { font: 650 1.2rem var(--display); margin-bottom: .3rem; }
.glosario dd { margin: 0; color: var(--tinta-suave); font-size: 1rem; }

.aviso { font-size: .95rem; color: var(--tinta-suave); border-top: 1px solid var(--agua-2); padding-top: 1.25rem; margin-top: 3rem; max-width: 46rem; }

/* ---------- Llamada final ---------- */
.llamada { background: var(--azul-hondo); color: var(--blanco); padding-block: clamp(3.5rem, 8vw, 6rem); }
.llamada h2 { color: var(--blanco); max-width: 20ch; }
.llamada p { max-width: 36rem; opacity: .9; }
.llamada .boton { background: var(--blanco); color: var(--azul-hondo); border-color: var(--blanco); }
.llamada .boton:hover { background: var(--agua); border-color: var(--agua); }
.llamada .boton--hueco { background: transparent; color: var(--blanco); border-color: rgba(255,255,255,.45); }
.llamada .boton--hueco:hover { background: rgba(255,255,255,.1); color: var(--blanco); }

/* ---------- Pie ---------- */
.pie { background: var(--tierra); color: var(--tierra-suave); padding-block: 4rem 2rem; font-size: .98rem; }
.pie a { color: var(--tierra-texto); text-decoration: none; }
.pie a:hover { color: #fff; text-decoration: underline; }
.pie .columnas { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 2.5rem; }
.pie img { width: 210px; margin-bottom: 1.25rem; }
.pie h2 { font-size: 1rem; color: #fff; letter-spacing: 0; margin-bottom: .8rem; }
.pie ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .45rem; }
.pie .legal { border-top: 1px solid var(--tierra-2); margin-top: 3rem; padding-top: 1.5rem; font-size: .85rem; line-height: 1.6; }
.pie .legal p { margin: 0 0 .4rem; }
@media (max-width: 760px) { .pie .columnas { grid-template-columns: 1fr; } }

/* ---------- Portada con vídeo de microscopio ---------- */
.portada-video {
  position: relative; isolation: isolate; overflow: hidden;
  min-height: min(88vh, 860px); display: flex; flex-direction: column; justify-content: flex-end;
  background: #0d1208; color: #fff; padding-top: 6rem;
}
.portada-video .fondo { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: -2; }
.portada-video::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(90deg, rgba(8,12,6,.82) 0%, rgba(8,12,6,.55) 45%, rgba(8,12,6,.1) 80%),
              linear-gradient(0deg, rgba(8,12,6,.6) 0%, rgba(8,12,6,0) 40%);
}
.portada-video h1 { color: #fff; max-width: 13ch; }
.portada-video .entradilla { color: rgba(255,255,255,.86); max-width: 34rem; }
.portada-video .botones { margin-top: 1.75rem; }
.boton--claro { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }
.boton--claro:hover { background: rgba(255,255,255,.12); border-color: #fff; color: #fff; }
.pie-video { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding-block: 2.5rem 1.25rem; font: 400 .85rem var(--display); color: rgba(255,255,255,.7); }
.pausa { font: 500 .85rem var(--display); color: #fff; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.35); border-radius: 999px; padding: .35rem .9rem; cursor: pointer; }
.pausa:hover { background: rgba(255,255,255,.2); }
@media (max-width: 700px) {
  .portada-video { min-height: 82vh; }
  .portada-video::before { background: linear-gradient(0deg, rgba(8,12,6,.9) 0%, rgba(8,12,6,.6) 55%, rgba(8,12,6,.25) 100%); }
}

/* La frase de la Microbiótica, sola */
.cita-grande--sola { max-width: 52rem; font-size: clamp(1.6rem, 2.8vw, 2.35rem); }

/* ---------- Retratos en Raíces ---------- */
.retratos { display: flex; gap: .6rem; margin: .5rem 0 .8rem; }
.hito:nth-child(odd) .retratos { justify-content: flex-start; }
.retrato { width: 68px; height: 68px; border-radius: 50%; object-fit: cover; border: 3px solid #fff; box-shadow: 0 0 0 1px var(--azul); }
.hito--inmi .retrato { width: 84px; height: 84px; }
.retrato.sello { object-fit: contain; background: #fff; padding: 7px; box-shadow: 0 0 0 1px var(--cielo); }
@media (max-width: 760px) { .hito:nth-child(odd) .retratos { justify-content: flex-start; } .retrato { width: 58px; height: 58px; } }

/* ---------- Lo invisible: silueta junto a las cifras ---------- */
.invisible { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
.invisible figure { margin: 0; }
.invisible figure img { width: 100%; border-radius: 14px; }
@media (max-width: 760px) { .invisible { grid-template-columns: 1fr; } }
@media (min-width: 601px) { .invisible .cifras li { grid-template-columns: minmax(8.5rem, 12rem) 1fr; } }
.invisible .cifras strong { font-size: clamp(1.8rem, 2.8vw, 2.4rem); }
@media (min-width: 761px) { .invisible .cifras li { grid-template-columns: 1fr; gap: .3rem; padding-block: 1.1rem; } }

/* Vídeo de microscopio dentro de "Lo invisible" */
.video-micro { margin: 0; }
.video-micro video { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; border-radius: 14px; background: #0d1208; display: block; }
.video-micro figcaption { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: .7rem; font: 400 .88rem var(--display); color: var(--tinta-suave); }
.video-micro .pausa { color: var(--tinta); background: var(--agua); border-color: var(--agua-2); }
.video-micro .pausa:hover { background: var(--agua-2); }